Patents by Inventor Siamak Sarhadi

Siamak Sarhadi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of forming an inductive magnetic head with approximate zero magnetostriction
    Patent number: 5920979
    Abstract: A low noise inductive magnetic head used for writing and reading magnetic signals onto and from a magnetic recording medium includes two magnetic poles P1, P2 that are formed on a substrate which define a transducing gap therebetween. Each of the poles P1, P2 includes an outer magnetic layer formed remotely from the gap and an inner magnetic layer formed adjacent to the gap. The inner and outer magnetic layers have magnetostrictions (.lambda..sub.s) of approximately equal but opposite values, such that each of the magnetic poles P1, P2 exhibits a net magnetostriction of zero or is biased within a predefined range, regardless of the individual magnetostriction values of its layers.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: July 13, 1999
    Assignee: Read-Rite Corporation
    Inventors: Daniel A. Nepela, Siamak Sarhadi
  • Multilayer exchange coupled magnetic poles with approximate zero magnetostriction
    Patent number: 5751528
    Abstract: A low noise inductive magnetic head used for writing and reading magnetic signals onto and from a magnetic recording medium includes two magnetic poles P1, P2 that are formed on a substrate which define a transducing gap therebetween. Each of the poles P1, P2 includes an outer magnetic layer formed remotely from the gap and an inner magnetic layer formed adjacent to the gap. The inner and outer magnetic layers have magnetostrictions (.lambda..sub.s) of approximately equal but opposite values, such that each of the magnetic poles P1, P2 exhibits a net magnetostriction of zero or is biased within a predefined range, regardless of the individual magnetostriction values of its layers.
    Type: Grant
    Filed: April 15, 1996
    Date of Patent: May 12, 1998
    Assignee: Read-Rite Corporation
    Inventors: Daniel A. Nepela, Siamak Sarhadi